hellobodytag.java

《深入学习Java Servlet》的源代码。本书作者：James Goodwill。

package com.djs;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.BodyTagSupport;

public class HelloBodyTag extends BodyTagSupport {

    public HelloBodyTag() {

    }

    // Method called when the closing hello tag is encountered
    public int doEndTag() throws JspException {

        try {

            // Get the content of this tag's body
            String name = bodyContent.getString();

            // We use the pageContext to get a Writer
            // We then print the text string Hello + the content
            // of the tag's body.
            pageContext.getOut().print("Hello " + name);
        }
        catch (Exception e) {

            throw new JspTagException(e.getMessage());
        }
        // return SKIP_BODY, because we will not evaluate the body again.
        return SKIP_BODY;
    }

    public void release() {

        // Call the parent's release to release any resources
        // used by the parent tag.
        // This is just good practice for when you start creating
        // hierarchies of tags.
        super.release();
    }
}